We consider a nonminimally coupled scalar field as potential cold dark matter candidate. These models are natural extensions of the ultralight axion which based on minimally fields. Such fields motivated by string theory and, in particular, have been studied context axiverse scenario. For field, scalar-field energy density behaves radiation at early times, yields bound coupling constant, $\ensu...

Direct detection of gravitational waves from several compact binary coalescences has ushered in a new era astronomy. It opened up the possibility detecting ultralight bosons, predicted by extensions Standard Model, their signatures. This is particular interest as some these hypothetical particles could be components dark matter that are expected to interact very weakly with Model particles, if ...

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant instability, which lead to a time evolution supermassive BH shadow. We study prospects for witnessing superradiance-induced shadow evolution, considering ultralight vector and tensor fields. introduce two observables sensitive time-evolution: drift, variation in azimuthal angle lapse associated photon ring ...

We report experimental studies of carbon nanofoam produced using a hydrothermal autoclave reactor with a sucrose solution and a small added amount of naphthalene. The foam has an average density of 85 mg/cc and is uniform in its appearance. He-ion microscopy (HeIM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize the foam samples. These show good consiste...

A versatile noncovalent functionalization strategy has been developed for the large-scale preparation of aqueous processable high-quality semiconducting 2D triazine polymers. In their Research Article (e202301865), Yuxi Xu et al. demonstrate that obtained crystalline ultrathin polymer nanosheets can not only be assembled into ultralight and mechanically strong macroscopic porous aerogels, but a...